The malicious code has been found and removed. Unfortunately adblocker may not help, as it didn't come through an ad. The bad code was injected into vbulletin system in encoded form, so it's harder to track. It's now been removed and patched.

I advise you guys to run an anti virus scan, just in case. Personally, I didn't find anything on my computer. However, other browsers may have different results.